Section I. Religious Demography
The U.S. government estimates the total population at 44.7 million (July 2018 estimate). Religious demographic and statistical data from nongovernmental organizations (NGOs), research centers, and religious leaders vary. According to a 2014 Pew Research Center study, Catholics constitute 71 percent of the population, Protestants 15 percent, and atheists, agnostics, and those with no religious affiliation 11 percent. Other sources state Seventh-day Adventists, Baptists, Jehovah’s Witnesses, Lutherans, Methodists, and members of The Church of Jesus Christ of Latter-day Saints (Church of Jesus Christ) together total 3 percent of the population. According to the Pew study, the Jewish population is approximately 0.5 percent, and the Muslim population is estimated at 1 percent. Evangelical Christian communities, particularly Pentecostals, are growing in size, but no reliable statistics are available. There are also a small number of Baha’is, Buddhists, and adherents of indigenous religions in the country; however, no data are available on the size of these groups.